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Derivative Instruments (Offsetting Assets) (Detail) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 22,570	$ 98
Gross Amounts Offset on the Consolidated Balance Sheets	0
Net Amounts of Assets Presented on the Consolidated Balance Sheets	22,570
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(3,135)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	19,435
Counterparty A
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	2,305
Gross Amounts Offset on the Consolidated Balance Sheets	0
Net Amounts of Assets Presented on the Consolidated Balance Sheets	2,305
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(78)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	2,227
Counterparty B
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	18,053
Gross Amounts Offset on the Consolidated Balance Sheets	0
Net Amounts of Assets Presented on the Consolidated Balance Sheets	18,053
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(1,823)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	16,230
Counterparty C
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	2,212
Gross Amounts Offset on the Consolidated Balance Sheets	0
Net Amounts of Assets Presented on the Consolidated Balance Sheets	2,212
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(1,234)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	$ 978

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